ATP Binding Cassette Subfamily B Member 1; ATP-Binding Cassette, Sub-Family B (MDR/TAP), Member 1; Multidrug Resistance Protein 1; Colchicin Sensitivity; P-Glycoprotein 1; EC 3.6.3.44; MDR1; PGY1; ATP-Binding Cassette Sub-Family B Member 1; Doxorubicin Resistance

The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the MDR/TAP subfamily. Members of the MDR/TAP subfamily are involved in multidrug resistance. The protein encoded by this gene is an ATP-dependent drug efflux pump for xenobiotic compounds with broad substrate specificity. It is responsible for decreased drug accumulation in multidrug-resistant cells and often mediates the development of resistance to anticancer drugs. This protein also functions as a transporter in the blood-brain barrier. Mutations in this gene are associated with colchicine resistance and Inflammatory bowel disease 13. Alternative splicing and the use of alternative promoters results in multiple transcript variants.